Four orca babies have been born in the last three months, a higher number than usual according to The Center for Whale Research.

Orcas in the area are called the Southern Residents and this baby boom brings their total to 81 whales.

"We hope this is a sustained upswing in the population, but they are endangered and will remain endangered until we can get their population up over 100," said Ken Balcomb with The Center for Whale Research.

The first calf of the season was spotted in December, followed by two in February and this last one in March.

Balcomb said CWR has been studying the Southern Residents for nearly 40 years. "Early on we used to have seven, eight orca babies, but recently we've had substantially less".

Michael Harris, executive director of the Pacific Whale Watch Association said efforts to improve the numbers of orcas include beefing up salmon in the area. "We're going to keep a careful watch on these babies and our fingers crossed -- and of course continue to do everything we can to rebuild these salmon runs and feed these whales."

Prosecutor Mehmet Selim Kiraz died in the hospital from injuries he suffered during the attack, Prime Minister Ahmet Davutoglu said, speaking to reporters on Turkish television.

The two gunmen who took the prosecutor hostage were killed in a shootout with police after a standoff that lasted for hours.

Kiraz was assigned to the controversial case of Berkin Elvan, a 15-year-old boy who was injured during the anti-government Gezi Park protests in June 2013.

The teen died the following March after having spent nine months in a coma. The case, with its overtones of possible police overreaction, has been politically contentious, just as the protests themselves were.

Turkish authorities described the gunmen involved in Tuesday's attack as terrorists.

President Recep Tayyip Erdogan said they were disguised as lawyers when they entered the courthouse.

"This is not to be taken lightly," he said.

The gunmen took the prosecutor hostage around 12:30 p.m. in his office on the sixth floor of the Caglayan district courthouse, the semiofficial Anadolu Agency reported.

Police evacuated that floor of the building, the agency reported, and snipers were deployed.

An explosion, followed by sounds of more gunshots, could be heard coming from the courthouse Tuesday evening, hours after the siege began.

Istanbul Police Chief Selami Altinok said Kiraz had been shot before Turkish security teams entered the room where the hostage crisis was unfolding.

"There is nothing else to do but to pray at this moment," Erdogan said.

On April 10, 1912, it set sail on its maiden voyage from Southampton, England, to New York.

April 14-15, 1912 - The luxury liner hits an iceberg in the North Atlantic around midnight and sinks in less than three hours.

Approximately 1,500 people died and nearly 700 survived out of about 2,220 passengers and crew.

The Ship:
The estimated cost of construction was $7.5 million (over $400 million today).

At the time, the R.M.S. Titanic was the largest passenger ship afloat.

The ship's length was 882 feet, 9 inches, and it weighed 46,328 tons. Its top speed was 23 knots.

The wreckage is located about 350 miles off the southeast coast of Newfoundland.

What was the cause?
In April 1912, there were about 300 icebergs in the North Atlantic shipping lanes, the most seen in the route between Europe and North America in 50 years.

The abundance of icebergs that year would also be something the Titanic's experienced captain, Edward Smith, would not have predicted. He'd been sailing the North Atlantic for 26 years and had not reduced the Titanic's speed despite receiving warnings of bergs ahead of his ship.

The iceberg punctured five of 16 supposedly watertight compartments designed to hold water in case of a breach to the hull.

Investigations at the time blamed Captain Smith for going too fast in dangerous waters, initial inspections that had been done too quickly, insufficient room in the lifeboats for all passengers, and a nearby ship's failure to help, according to Britannica.com.

Many maritime safety reforms were implemented as a result of the findings of the investigations.

Died -
- Colonel John Jacob Astor, member of the Astor family.
- Isidor Straus, merchant and banker, co-owner of Macy's.
- Benjamin Guggenheim, member of the Guggenheim family.
- George D. Widener, son of P.A.B. Widener, Philadelphia businessman.
- Washington Roebling, uncle was a builder of the Brooklyn Bridge.
- Charles Melville Hays, General Manager of the Grand Trunk Railway.
- William Thomas Stead, famous journalist and publicist.
- Jacques Futrelle, journalist.
- Henry Birkhardt Harris, theatrical manager.
- Major Archibald Butt, military aide to President Taft and President Roosevelt.
- Francis Davis Millet, American painter.

Other Facts:
The facts surrounding the ill-fated maiden voyage permeate popular culture, spawning countless books, television specials, and movies.

"Titanic," a 1997 James Cameron film based on the disaster, is the second highest-grossing film of all time, domestically and worldwide, earning over $650 million at the box office.

Timeline: (all are local time, based on the location of the ship.)
March 31, 1909 - Construction begins, as a design collaboration between William Pirrie's firm Harland and Wolff and J. Bruce Ismay's White Star Line, in Belfast, Ireland, and takes three years to complete.

April 10, 1912, 12pm - The RMS Titanic sets sail from Southampton, England, on its maiden voyage, with approximately 2,220 passengers and crew.

April 10, 1912, 6:30pm - Arrival in Cherbourg, France.

April 10, 1912, 8:10pm - Leaves Cherbourg.

April 11, 1912, 11:30am - Arrival in Queenstown, Ireland.

April 11, 1912, 1:30pm - Leaves Queenstown, raising anchor for the last time.

April 14, 1912, 11:40pm - The Titanic hits the iceberg. Lookouts Frederick Fleet and Reginald Lee first see the iceberg and alert the bridge.

April 15, 1912, 12:40am - Captain Edward Smith gives the order to uncover the lifeboats and evacuate women and children.

April 15, 1912, 12:20am - The RMS Carpathia receives distress calls and heads to the site to help. It arrives at 3:30am.

April 15, 1912, 12:45am - The first lifeboat is launched with 28 people on board out of a capacity of 65.

April 15, 1912, 2:20am - The Titanic sinks in less than three hours.

April 15, 1912, 8:50am - The Carpathia leaves for New York with 705 Titanic survivors onboard. It arrives April 18th.

April and May 1912 - Separate American and British investigations and official inquiries take place.

September 1, 1985 - Scientists from Woods Hole Deep Submergence LAB (DSL) in Massachusetts, led by Dr. Robert Ballard, and IFREMER, the French Institute Francais de Recherche pour l'Exploitation des Mers, led by Jean Jarry locate the wreckage of Titanic.

July 13, 1986 - Dr. Robert Ballard and his crew use the manned deep-ocean research submersible Alvin (DSV-2) to explore the wreckage. Alvin is accompanied by a remotely operated vehicle (ROV) named Jason Jr. to conduct photographic surveys and further inspections.

2004 - Guernsey's auctions off memorabilia and a few artifacts that had been passed down through the families of survivors from the ship, including an original menu that goes for about $100,000.

May 31, 2009 - The last known survivor, Millvina Dean, dies at age 97.

March 31, 2012 - The world's largest Titanic attraction opens in Belfast, Northern Ireland, where the ship was built.

April 8-20, 2012 - The 100th anniversary of Titanic's only voyage. The MS Balmoral traces the ship's route from Southampton to New York and holds a memorial service on April 15 above the wreck.

March 2015 - A letter said to have been written by a mother and daughter once aboard the Titanic is displayed at the Titanic's Belfast center in Ireland. The letter was purchased at auction by a couple who then loaned the letter to be displayed at the world's largest Titanic exhibition for the next five years.

No financial terms of the contract were announced, but it was reported to be worth $3 million. Schaub returned to the West Coast after meeting with the Ravens.

Schaub spent last season with the Oakland Raiders as a backup behind rookie Derek Carr. According to the Baltimore Sun, Schaub also received interest from the Atlanta Falcons, Dallas Cowboys and Tennessee Titans before signing with the Ravens.

The 33-year-old Schaub gives the Ravens a veteran behind Flacco. The only other quarterbacks currently on the Baltimore roster are inexperienced Keith Wenning and Bryn Renner.

Schaub struggled with elbow tendinitis last season with the Raiders and completed only 5 of 10 passes for 57 yards and two interceptions with no touchdowns. He spent the previous seven seasons as the starter for the Houston Texans and was with the Atlanta Falcons from 2004 to 2006.

In 11 NFL seasons, Schaub has completed 2,040 of 3,191 passes (63.9 percent) for 24,311 yards and 130 touchdowns iwth 86 interceptions. He was named to the Pro Bowl after the 2009 and 2012 seasons.

The Raiders released Schaub earlier this month after signing Christian Ponder, saving the team $5.5 million against the salary cap.